I the poor rabbit, but I didn’t have the right drugs with me at that moment.
A. saved
B. had saved
C. could save
D. could have saved
网友回答
A. saved
B. had saved
C. could save
(答案→)D. could have saved
解析：考查情态动词表推测 我本可以挽救这只可怜的兔子的，但我当时没有合适的药品。could have done表示本可以做某事但实际上没做。是对过去动作的推测。